Gentoo Archives: gentoo-user

From: Pandu Poluan <pandu@××××××.info>
To: gentoo-user@l.g.o
Subject: RE: [gentoo-user] New computer and Gentoo
Date: Thu, 21 Jul 2011 08:59:41
Message-Id: jGNsKwmprbmY.p3gJYCqF@smtp.gmail.com
1 -original message-
2 Subject: Re: [gentoo-user] New computer and Gentoo
3 From: Bill Kenworthy <billk@×××××××××.au>
4 Date: 2011-07-21 12:54
5
6 >On Thu, 2011-07-21 at 06:26 +0100, Mick wrote:
7 >> On Thursday 21 Jul 2011 03:29:17 Adam Carter wrote:
8 >> > amd64 means any x86 64bit platform, so Intel too.
9 >> >
10 >> > march=native is good if you're not using distcc, or if you're only
11 >> > using distcc on core2 boxes. Otherwise be specific.
12 >>
13 >> I recommend using the "64 bit profile (amd64) for >= GCC 4.3" which shows -
14 >> march=core2. This is what I use here with multilib and had no problems.
15 >
16 >Ive just stumbled on something weird with march=native:
17 >
18 >At some point I had march=prescott on a core2 E4600 running 32bit -
19 >worked well. Changed to march=native and did some upgrades with a few
20 >odd things like asterisk segfaulting in a glibc library afterwards, and
21 >some things not building. Then to add confusion, I changed to an
22 >pentium Duo E6600 (flies!) and added another stick of ram. More odd
23 >things happening such as reiserfs oopsing on shutdown.
24 >
25 >Last night the penny dropped and I looked the new processor up and
26 >changed to march=core2 and have mostly corrected (recompiled) the
27 >damage.
28 >
29 >So not sure about march=native now as it is only what was built with
30 >native thats been problematic. With 20-20 hindsight it was perhaps
31 >predictable ...
32
33 IMO you're not supposed to compile part of the system with -march=<something> and the rest with -march=native. The instructions (and optimizations) emitted by -march=native might not be compatible with your previous -march.
34
35 I had deployed more than 10 Gentoo servers using -march=native without any problem.
36
37 CMIIW
38
39 Rgds,
40 --
41 FdS Pandu E Poluan
42 ~ IT Optimizer ~
43
44 Sent from Nokia E72-1

Replies

Subject Author
Re: [gentoo-user] New computer and Gentoo Florian Philipp <lists@×××××××××××.net>